Valve-motion for pneumatic tools.



R. L. AMBROSE. VALVE MOTION 4POR PNEUMATIC TOOLS.

APPLICA'TTIPN FILED MAY 22, 1912.

Patented Mar. 16, 1915,

3 SHEETS-SHEET 1.

R. L. AMBROSE. VALVE MOTION FOR PNEUMATIC TOOLS.

APPLICATION FILED MAY 22, 1912.

Patented Mar. 16, 1915.

3 SHEETS-SHEET 2.

Irl

R. L. AMBROSE.- 'VALVE MOTION POR PNEUMATICI TOOLS.

APPLICATION FILED MAY 22. 1912, 1,1 31 ,8l 2;-

3 SHEETS-SHEET 3.

Patented Mar. 116, 1915.

sTATEs PATENT oEEroE.

f EOEEET LUNNAN AiichanosE,` OE EASTON, PENNSYLVANIA, AssieNoE To INGERSOLE- vNAND OOMEANY, `OE 4NEW` YORK, N. Y., A CORPORATION OE NEW JERSEY.

'vALvEfMOTI'ON' EOE PNEUMATIC TOOLS.

To all 'whom it may concern lBe it known that I, ROBERT lL.' AMBROSE,

ofEaston, in the county of Northampton,

:which shall have, among Others, the advanperinitting the tool to strike an un-v tages. of p l cushioned blow;,of throwing the Valveand holding it, afterit isthrown, with certainty,

and of 'permitting the use of a3 relatively `simplified arrangement of ports, and to such ends my invention consists in the valve motion hereinafter specified,

In the accompanying drawingsi Figures l and 2 are diagrammatic sectional views in theform of a u wingvbeing preferably tapered so that' .its

Fig; 5. is a sectionof Fig.

of a valve motion embodying my invention,

showing the two positions ofthe valve; Fig. 3 isla plan view with the cover of-the valve box removed and the valve in section of a commercial embodiment of my invention; Fig.4 is a view on the line 4-4 of Fig. 3; 3 on the linea-"5; and Fig. 6 is a section of Fig. 4 on the line 6 6. i

i My invention is capable of embodimentl in many dierent forms. I/have illustrated that embodiment which 1s the best one lmown to me, but` thel illustrated embodiment is to be regarded as typical only of many possible embodiments.

In the embodiment illustrated in Figs. v1

and 2, a cylinder 1 contains a piston 2. In

the valve box 3 there is an inlet port hand an4 exhaust port 5. 'A/valve is provided, which preferably has a cylindrical bodyA 6, and four wings,respectively, 6b, 6, 6d and 6. The cylindrical body 6a is'mounted 1n a cylindrical -borey in the valve-box and' serves as a trunnion on which the valve as a whole osoillates. The wing 6b is vlocated in thel inlet port 4f, such port being preferably parallel-walled slot, and the against one or the Opposite faces may fit ports 7 and other wall of said slot to close y8 therein. The port 7 extends to the forward end of the cylinder and preferably Venters said cylinder at a point so far forward that no air cany be trapped beyond 1t Specication of letters Patent.

:- ward limit of its travel.

Patented Mar.. 116, ifl..

Appucation mea May 22, 191,2. serial No'. ceases.

by the piston, thus permitting the piston to strike an uncushionedv blow. The Aport 8 enters the rear end of the cylinder, but preferably `at a point slightly forward of such rear end, so that air may be trapped therein to cushion the return stroke. of thepiston. A branch porti) extends from the right wall of the exhaust slot 5 to a connection with the perf: C1', and an exhaust port A10 extends from the left wall of the said exhaust slot to a connection with the said slot 8. Theadmission and exhaust of air to and from thel cylinder for the purpose of vdrlvmg the piston is controlled lentirely' by the wings 6b and'i.4 It is for the purpose' of throwing or shifting the valve at the proper times that the wings (ic and 6d are provided.v The wing 6 is mounted in 4a slot 11 having a port 12 opening through the upper wall and entering the cylinder at a point where .it is uncovered by the rear end of the piston shortly before the piston reaches the fory The wing 6d isv mounted in a slot 13 having a port 14 opening through its upper wall and entering the cylinder at a point whereit is uncovered by the forward end of the piston, after 'the piston had gotten well started on itsreturnstroke. The edges of the wings 6c and 6d lit thejvertical Walls of their slots so that they may act as pistons therein. Grooves 15 extend'from the bottoms of the slots 11 and 13 to the exhaust slot 5, so lthat any live air 4v'vlpjch may leak from the upper to theV lower sides of the wings 6 and. Gd may escape and not produce back pressure.

In the rOperation of my valve motion, as shown in Figs. 1 and 2, the piston being assumed to be at the rear end of the cylinder,

and the valve in the position shown in Fig. 2, the live air from the slot 4 passes through the port 8 to the rear end of the cylinder driving the piston forward, the 'airA ahead `Of the piston being exhausted through the,

ports 7 and 9 into the exhaust sloth. Y'This condition' continues until the piston passes beyond the port 12, when the live air ruehes up such port, and bearing on the upper surf.

face of the wing 6 forces the latter'dovvl, shifting the valve to the position shown 'm Fig. 1 and holding it in such position. By

the time the piston has uncovered thel port 12, the piston is traveling at such high velocity that it delivers its blow before the live air is admitted to the forward end of the e jelted 'ont e The shitting oi the valve te the pesition shown in' Fig. l closes the port 8 Vley incarna of the valve Wing 6" and exposes the live .ein port l., the Wing e et the same time closing the branch port 9 and 'opening the bifanch port l0 to the exhaust 'Live air new the forward end of the cylinder' bythe eertfland' stents the pis'tcnback, the air at the rear of the piston being exhausted thnougli the ports 8' and 1P. 'lliis action continues until the ,forward end of the pis ten yunwvejrs the per?, lil? when live air rushes n@ such geert52 and bearing on the iippen of the wing' 8 oces the e dcvvn7 theel shifting. the valve to the` position shown in Fig. l. The live air' fjeresses on the said wing end iholds the valve positively in position until the iles rebounded and come forward e selhciently to expose Athe rport l2. .The pis.

faim? @if the live plicityV-end neiniits the valve chest .to beV lighteivin. Weight because lessmetalis 'reeg quired te ecccnrmedate the porte.

the commercial embodii shown in Figs. 3 to 6, as that shown in Figs.

The et ment of nay invm"u in.elusiveg is the e ii, and 2 'liefert v bediuient (Figw Uv Sande apen-a valve seat, ci ei'yielvelbon; i8? l stance, is cast .upon

d in the bottom esent in- The cover-.19. The velve has teer ports .formed .itj namelyE tno live-i ports 20 and'vl, re'spectivelye and tivo exhaust pontsE 22and 23g-f respectively, the live ports 5 correspondingte the ports e and. l? respectively, of `Figs. l and. 2, and the exhaust ports corresponding to the poets 9 endl() of the said iiguree respectively, Bowel Eins 23?? hold the valve seat in proper pesition.

e Byv malring'the valve seat. a separate piece of metal the ports can be'ornied in 1t much l more cheaply end accurately than if they were formed in the main*cylinder Hcasting., l preferably form in the main cylinder cast a port 24 connecting the forward end ot the cylinder with the port2l thevalye 'seatg end corresponding to the passage l 1n Figs. l. and 2. 'l' also' ferm. a port 25 from the reen end oli the cylinder connecting with ing to the port or passage .8 in Figs. l and 2.. A branch port 26 coiniects the port 24:

with the port 23 inthe valve seat ,and con',

ireoonds to the breechA or exhanstport 9# described. lt rests valveand valve lie c ce by e' the pent 20 in the valve seat, and coriespondigiene-ie nects the port 25 with. the' ehaust port 22 in theY valve i seat and corresponds-to the branch oit exhaust port 10 .in Figs. 1 and 2.

' Ay port 28 opens from the valve box directly into the cylinder below and corresponds to 7( thevportv l2 of Figs. l and'2. A port 29 opens from the forward portion of the cyl-4 inder into the valve box and corresponds 'to the vport 14 of Figs.' l and 2,; .The live air enters by the connection 30 and is exhausted n through the, connection 81. Y

. is the operation ol' the form shovvn in Figs 3 to 6 is the same as that .shown in Figs. 1 and 2, it is unnecessary to describe it,

ly claim: l. ln a valve motion, the combination of a cylinder vand piston, supply and exhaust ports, `a valve having `opposite Wings. adapt ed tov control said ports vby a jmovement toi Ward;v and away from the 4saine in a direction s! longitudinal of the ports, other opposite Wing surfaces adapted to'be used in shifting ports, e rotatable valve having Wings adapt l@ ed to control. said ports by a movement to.- Ward and away from the same in a direction longitudinal of the ports, the ports for each end of the cylinder entering the latter at the same point relative to its length5 and means lo for shiftingsaid valve.

de ln a valve motion, the combination of a cylinder and piston, supply and exhaust ports, a rotatable valve hevingvvings adapted to controlsaid ports by a movement to- 11 Ward and away from the saine in a direction Y, longitudinal ofthe ports, the ports 'for each end of the cylindei` entering the latter at the saine point relative to its length, and means lor shifting said valve, said means compris- 1L ing valve shifting wings. and porte adapted to admit air to said wings.)

5. ln a valve inotion, the combination of a cylinder: and piston, a rotatable valve having supply and-exhaust controlling wingsfl on opposite sides of its center, and aport from each end of the cylinder tol opposite sides of said Avalve,said 'ports branching tosaid supply and exhaust icon tiollug Wings.

ln a. valve motion$ the combination of 191 a .cylinder and piston, a rotiiteble-valvehaving supply and exhaust controlling wings on opposite sides'of its center, e 'port' fromeach end of the zcylinder to opposite sides of l ply and exhaust controlling wings, opposite ports,

valve shifting Wings, and ports for admitting air to said latter Wings.

7. In a valve motion, the combination of a cylinder and piston, supply and exhaust a rotatablevalve having Wings adapted to control said ports byl a movement tovvard and awav from the same in a direction.

the ports, said valve having Aopposite vvlngs, other than the parts for conlong'itu'dinal of Ward and away from the same in a direction a cylinder a rotative valve,

longitudinal of th ports, said valve having opposite Wings, other tlian the parts for con-k trolling said ports, for-v shifting the valve, said wings being seated in slots against which the edges of said wings lit, and ports opening into said slotsfrom points in said cylinder for admitting air to act on said Wings, saidlast .mentioned ports being adaptedl to be uncovered by the piston as the latter passes cylinder. f

9. ln vapneumatic tool, the combination of a cylindrical box toward the opposite `end of the containing said valve,

the bottom thereof, and a separate valve seat located over said ports andhaving said valve resting thereon.

10. In a pneumatic tool, the combination 4@ of a cylinder and piston, a cylindrical valve casing formed on the cylinder and perpendicular thereto, ports from said cylinder entering the bottom of said valve box, a' valve seat seated in said cylinder andhaving ports 45 therethrough, a rotative valve mounted 1nY .said valve box casing on said valve seat and a cover completelyA closing the top of said casing.

11.,In a percussive engine the combina-v '50 a valve chest tion 'of a cylinder, its piston,

comprising Ya central and a valve therein,

body portion and a plurality of radiating a Wings, one Wing controlling the inlet ports leading to Wing controllingthe exhaust from the`l ends of the'l cylinder, another Wing controlling the movement of the'valve but being free from control of the admissionor exhaust ports of the cylinder, the engine having 60 ports connecting the cylinder with faces of the controlling Wing or Wings.

In testimony that l claim the bregoing ll have hereunto set my hand. 1 .r l ROBERT LUNNAN AMBROSE.

Witnesses:

ROYAL J. JOHN F.

Der. Moon.

i avalve box casing on 35 said cylinder having ports opening through the ends of the cylinder, another 55 

